Experience
I have exp with both of these pads and Kick=eze were the best, before Limbsaver were made, now all of my guns have limbsavers. I use the slip on models because I'm 6' 5" and can use a little extra lenth they provide. Real handy for me this week when I shot all of my Marlin lever guns. I also have the limbsaver shoulder guard which I tried out for the first time. I shot 30 rounds of 308, 10 32 Win sp, 18 35 Rem,15 3030. Nothing but a golf shirt underneath. Next day zero stiffness in the shoulder, quite amazing I think. FS